For i = 1,2 .... ,k, let Gi be a graph with vertex set [n] = {1 .... ,n} containing no Fi as a subgraph. At most how many edges are in G1 t3 -• • U Gk? We shall answer this Turfin-Ramseytype question asymptotically, and pose a number of related problems. Given graphs F1 ..... Fk, write exk(n,F 1 ..
On Ramsey-Turán type problems in tournaments
✍ Scribed by A Bialostocki; N Sauer
- Publisher
- Elsevier Science
- Year
- 1986
- Tongue
- English
- Weight
- 467 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0012-365X
No coin nor oath required. For personal study only.
✦ Synopsis
Let Tbe a tournament and let c :e(T)--> {1 ..... r} be an r-colouring of the edges of T. The associated reachability graph, denoted by R(T, c) is a directed graph whose vertices are the vertices of T, and a vertex v of R(T, c) dominates a vertex u of R(T, c) iff there is a monochromatic directed path in T from v to u.
In this paper we investigate properties of the reachability graph of edge coloured tournaments.
📜 SIMILAR VOLUMES
## Abstract For each __n__ and __k__, we examine bounds on the largest number __m__ so that for any __k__‐coloring of the edges of __K~n~__ there exists a copy of __K~m~__ whose edges receive at most __k−__1 colors. We show that for $k \ge \sqrt{n}\;+\,\Omega(n^{1/3})$, the largest value of __m__ i
## Abstract We explicitly construct four infinite families of irreducible triple systems with Ramsey‐Turán density less than the Turán density. Two of our families generalize isolated examples of Sidorenko 14, and the first author and Rödl 12. Our constructions also yield two infinite families of i
We consider the following analogue of a problem of Turin for interval graphs: Let c = c(n, rn) be the largest integer such that any interval graph with n vertices and at least m edges contains a complete subgraph on c vertices. We determine the value of c(n, m) explicitly.
## Abstract For a graph __G__ whose number of edges is divisible by __k__, let __R__(__G,Z__~k~) denote the minimum integer __r__ such that for every function __f__: __E__(__K__~r~) ↦ __Z__~k~ there is a copy __G__^1^ of __G__ in __K__~r~ so that Σe∈__E__(__G__^1^) __f(e)__ = 0 (in __Z__~k~). We pr
It is proved that for any 3-coloring of R 3 and for any right-angled triangle T, one can find a congruent copy of T, all of whose vertices are of the same color.